I bought a model 25-10 brand new . I quickly discovered that it leaded the barrel , really bad and it shot very high with my standard 255gr cast bullets using current alliant load data . I had my friend , an amateur gunsmith locate the cross pin on the front sight ( very very hard to find ) and install a much taller partridge front sight . When I slugged the barrel I discovered the groove diameter to be approx .453 and there was a terrible choke (tight spot) where the barrel threaded onto the frame . After driving a lead slug through it , I measured it and found my lead slug now measured .449 . The cylinder throats were undersize vs the barrel , .452 . I finally got most of the issues remedied , by then I was tired of fooling with it so I sold it . I have never wanted it back again . I do have a 25-5 , 4" that's a real pleasure to shoot . The internal measurements on this one were spot on . You might have better luck buying a new 25 Classic than I did . Regards, Paul